User`s guide

Transforms
4-13
- Input is in bit-reversed order =
-
Input is conjugate symmetric =
•In the Sum block, set
List of signs = |++.
•In the Gain block, set
Gain = -1.
•In the
Scope properties panel of the Vector Scope block, set
Input domain = Time
•Set the
Stop time in the Parameters dialog box to inf, and start the
simulation by selecting
Start from the Simulation menu.
The flat line on the scope suggests that there is no difference between the two
signals, and that the IFFT block has perfectly reconstructed the original
time-domain signal from the frequency-domain input.
More precisely, the two signals are identical to within round-off error, which
can be seen by selecting
Autoscale from the right-click menu on the scope. The
enlarged trace shows that the differences between the two signals are on the
order of 10
-15
.